cvs commit: src/usr.sbin/syslogd syslogd.c

Robert Watson rwatson at
Fri Mar 31 16:24:31 UTC 2006

On Fri, 31 Mar 2006, Alexander Leidinger wrote:

> Robert Watson <rwatson at> wrote:
>> The cost to check for free space is the cost of a fstatfs() system call on 
>> the file descriptor of the log file.  This should be handled without 
>> touching the disk, so while it's not a cheap system call compared to, say, 
>> getpid(), as it acquires locks and enters VFS, it's a lot cheaper than any 
>> disk I/O operation. Optional is good, if only because sometimes people do 
>> actually want logging to fill the disk, and that's been the behavior 
>> historically :-).
> Do you know if a kqueue based solution is cheaper?

I think that before solving this problem, we should establish it is one.  I'm 
not convinced it will be.

Robert N M Watson

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